Re: Spindle Speed Variation
What is your PD 071 (Analog Filtering) set to? Try increasing it.
Re: Spindle Speed Variation
Quote:
Originally Posted by
CitizenOfDreams
What is your PD 071 (Analog Filtering) set to? Try increasing it.
PD 071=20
Tried 30,35,40,50 and no real change, issue remains.
I also tried having a dedicated shielded cable for the 10v, 0v, and analog signal from controller board to vfd but issue remains. Thought it was a noise issue because of how the speed increases then decreases then increases and so on.
I checked the settings on UCCNC for the PWM frequency and was set to 400 hz while the manual for the bob (ub1) recommeneded 1524 hz so I used this value. This change helped getting ride of the variable speeds. When set to 12,000 on uccnc, vfd now reads 15144 then goes up to 15 162rmp for a second then down to 15 144. This small variation is acceptable but how can i tweak the settings to get 12 000 rpm at the vfd when that value is set on uccnc?
Re: Spindle Speed Variation
Quote:
Originally Posted by
Phil_Par
PD 071=20
Tried 30,35,40,50 and no real change, issue remains.
I also tried having a dedicated shielded cable for the 10v, 0v, and analog signal from controller board to vfd but issue remains. Thought it was a noise issue because of how the speed increases then decreases then increases and so on.
I checked the settings on UCCNC for the PWM frequency and was set to 400 hz while the manual for the bob (ub1) recommeneded 1524 hz so I used this value. This change helped getting ride of the variable speeds. When set to 12,000 on uccnc, vfd now reads 15144 then goes up to 15 162rmp for a second then down to 15 144. This small variation is acceptable but how can i tweak the settings to get 12 000 rpm at the vfd when that value is set on uccnc?
How many Amps is your 240v supply to the VFD Drive
Re: Spindle Speed Variation
Quote:
Originally Posted by
Phil_Par
PD 071=20
Tried 30,35,40,50 and no real change, issue remains.
I also tried having a dedicated shielded cable for the 10v, 0v, and analog signal from controller board to vfd but issue remains. Thought it was a noise issue because of how the speed increases then decreases then increases and so on.
I checked the settings on UCCNC for the PWM frequency and was set to 400 hz while the manual for the bob (ub1) recommeneded 1524 hz so I used this value. This change helped getting ride of the variable speeds. When set to 12,000 on uccnc, vfd now reads 15144 then goes up to 15 162rmp for a second then down to 15 144. This small variation is acceptable but how can i tweak the settings to get 12 000 rpm at the vfd when that value is set on uccnc?
You first have to correct the 0-10v Analog output at the Board level before you do anything with the VFD Drive, 1524hz does not sound correct for the PWM to Analog 0-10v normally 100Hz is what is used
Re: Spindle Speed Variation
Hello. Did you ever figure this out?
I'm having the same issue and was hoping for a pointer...
I'm starting to believe its a bad VFD, but everything is running as it should other then the speed.
Local control, the speed is steady as a rock. Remotely, its fluctuating nearly 2,000rpms.
Thanks
Thread: https://www.cnczone.com/forums/spind...ng-speeds.html
Re: Spindle Speed Variation
Quote:
Originally Posted by
Mogal
Hello. Did you ever figure this out?
I'm having the same issue and was hoping for a pointer...
I'm starting to believe its a bad VFD, but everything is running as it should other then the speed.
Local control, the speed is steady as a rock. Remotely, its fluctuating nearly 2,000rpms.
Thanks
Thread:
https://www.cnczone.com/forums/spind...ng-speeds.html
How do you have everything wired, what is the output from your Breakout Board you need to have the 0-10v working correct before connecting to the VFD Drive
Re: Spindle Speed Variation
Hi Mac, thanks.
I have some new cabling coming and will tidy up my wiring a little better.
I'm currently using two shielded 18/4 cables. One dedicated to relay, one dedicated to speeds.
My VFD outputs 9.98v
From your pointers above, I'll try changing some of the settings.
Particularly, PD71 and the frequency setting to 100hz.
2 Attachment(s)
Re: Spindle Speed Variation
Quote:
Originally Posted by
Mogal
Hi Mac, thanks.
I have some new cabling coming and will tidy up my wiring a little better.
I'm currently using two shielded 18/4 cables. One dedicated to relay, one dedicated to speeds.
My VFD outputs 9.98v
From your pointers above, I'll try changing some of the settings.
Particularly, PD71 and the frequency setting to 100hz.
Do you have the shields clamped to the Ground Plane, any unused wires in a cable have to be Grounded at both ends or you can have interference problems, so you would be better to use just the (1) cable and correctly terminate the Shield, a P-Clip is better than a saddle which you can make yourself, but must clamp tight around the shield
PD071 is a Filter and does not have anything to do with 100Hz setting it has a setting range from 0-50 and changes the response time
The setting of this parameter is related to the analog responding speed. The higher the value of PD071 is set, the lower the analog responding speed will be. default is 20 and is not normally needed to be changed
